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2017 ; 12
(7
): e0180297
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Repositioning Bazedoxifene as a novel IL-6/GP130 signaling antagonist for human
rhabdomyosarcoma therapy
#MMPMID28672024
Xiao H
; Bid HK
; Chen X
; Wu X
; Wei J
; Bian Y
; Zhao C
; Li H
; Li C
; Lin J
PLoS One
2017[]; 12
(7
): e0180297
PMID28672024
show ga
Interleukins-6 (IL-6)/GP130 signaling pathway represents a promising target for
cancer therapy due to its critical role in survival and progression of multiple
types of cancer. We have identified Bazedoxifene, a Food and Drug Administration
(FDA)-approved drug used for the prevention of postmenopausal osteoporosis, with
novel function as inhibitor of IL-6/GP130 interaction. In this study, we
investigate the effect of Bazedoxifene in rhabdomyosarcoma and evaluate whether
inhibiting IL-6/GP130 signaling is an effective therapeutic strategy for
rhabdomyosarcoma. The inhibitory effect of Bazedoxifene was assessed in
rhabdomyosarcoma cell lines in vitro and RH30 xenograft model was used to further
examine the suppressive efficacy of Bazedoxifene on tumor growth in vivo.
Rhabdomyosarcoma cells showed their sensitivity to GP130 inhibition using gene
knockdown or neutralized antibody, suggesting IL-6/GP130 as therapeutic target in
rhabdomyosarcoma cells. Bazedoxifene decreased the signal transducer and
activator of transcription3 (STAT3) phosphorylation, blocked STAT3 DNA binding,
and down-regulated the expression of STAT3 downstream genes. Bazedoxifene also
induced cell apoptosis, reduced cell viability, and inhibited colony formation in
rhabdomyosarcoma cells. The inhibition of colony formation, STAT3
phosphorylation, or cell viability following Bazedoxifene treatment was partially
reversed by addition of excess IL-6 or overexpression of constitutive STAT3,
respectively, supporting Bazedoxifene acted through IL-6/GP130 signaling. In
addition, Bazedoxifene repressed cell invasion and angiogenesis in vitro.
Furthermore, oral administration of Bazedoxifene significantly suppressed tumor
growth and expression of STAT3 phosphorylation in nude mice bearing established
human rhabdomyosarcoma xenograft. Taken together, these findings validate
IL-6/GP130 signaling as therapeutic target in rhabdomyosarcoma and provide first
evidence that Bazedoxifene may serve as a novel promising drug targeting
IL-6/GP130 for treatment of rhabdomyosarcoma.